Laws of Chemical CombinationPractice Questions & MCQs
Practice Laws of Chemical Combination questions from Atoms and Molecules (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Laws of Chemical CombinationQuiz - Solve & Score
Q1. Which postulate of Dalton's atomic theory directly explains the law of conservation of mass?
- A.atoms are neither created nor destroyed in a chemical reaction
- B.atoms of different elements have different masses
- C.atoms combine in small whole-number ratios
- D.atoms are divisible into electrons
Answer: A. atoms are neither created nor destroyed in a chemical reaction
Q2. Which postulate of Dalton's theory explains the law of constant proportions?
- A.atoms combine in a fixed, simple whole-number ratio in a given compound
- B.atoms are neither created nor destroyed
- C.atoms are indivisible
- D.all matter is made of atoms
Answer: A. atoms combine in a fixed, simple whole-number ratio in a given compound
Q3. Which observation would VIOLATE the law of constant proportions if it were ever found true?
- A.pure water samples with different hydrogen-to-oxygen mass ratios
- B.all pure water having the same 1:8 H:O ratio
- C.mass being conserved in a reaction
- D.excess reactant remaining unreacted
Answer: A. pure water samples with different hydrogen-to-oxygen mass ratios
Master Laws of Chemical Combination on RankByte
Step-by-step solutions, mock tests, live ranks and streaks - free to start.
Get early accessLaws of Chemical Combination - Frequently asked questions
Where can I practise Laws of Chemical Combination questions for Class 9 Science?
RankByte has Laws of Chemical Combination practice questions and MCQs from Atoms and Molecules (Class 9 Science), each with the correct answer and a step-by-step solution - free to start.
Are these Laws of Chemical Combination questions important for the exam?
Yes. These Laws of Chemical Combination important questions follow the Science exam pattern (CBSE Boards, plus JEE and NEET foundation), so they help with both school and competitive prep.
Do the Laws of Chemical Combination questions come with answers and solutions?
Every Laws of Chemical Combination question on RankByte comes with the correct answer and a full step-by-step solution, so you learn the concept instead of just guessing.